Hi Chris
Welcome to the club.
I'm not familiar with the model.
I popped into my local Yamaha dealer for chain and sprocket prices
and thought I'd ask about your TDR.
Well he hadn't heard of such a bike.
He suggested it may be possible that it was imported as a different
model name.
Anyway he's more than happy to answer any questions you have.
If possible send him a small sized image of it.
Tell him what year model it is with as much information as possible.
His Email is parrys@...
Sorry I didn't take his name.
Best of luck
Tony